package org.example.lotterysystem.service.impl;

import org.example.lotterysystem.common.errorcode.ServiceErrorCode;
import org.example.lotterysystem.common.exception.ServiceException;
import org.example.lotterysystem.common.utils.JacksonUtil;
import org.example.lotterysystem.common.utils.RedisUtil;
import org.example.lotterysystem.controller.param.CreateActivityParam;
import org.example.lotterysystem.controller.param.CreateUserByActivityParam;
import org.example.lotterysystem.controller.param.CreatePrizeByActivityParam;
import org.example.lotterysystem.controller.param.PageParam;
import org.example.lotterysystem.dao.dataobject.ActivityDO;
import org.example.lotterysystem.dao.dataobject.ActivityPrizeDO;
import org.example.lotterysystem.dao.dataobject.ActivityUserDO;
import org.example.lotterysystem.dao.dataobject.PrizeDO;
import org.example.lotterysystem.dao.mapper.*;
import org.example.lotterysystem.service.ActivityService;
import org.example.lotterysystem.service.dto.ActivityDTO;
import org.example.lotterysystem.service.dto.ActivityDetailDTO;
import org.example.lotterysystem.service.dto.CreateActivityDTO;
import org.example.lotterysystem.service.dto.PageListDTO;
import org.example.lotterysystem.service.enums.ActivityPrizeStatusEnum;
import org.example.lotterysystem.service.enums.ActivityPrizeTiersEnum;
import org.example.lotterysystem.service.enums.ActivityStatusEnum;
import org.example.lotterysystem.service.enums.ActivityUserStatusEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

@Service
public class ActivityServiceImpl implements ActivityService {
    private static final Logger log = LoggerFactory.getLogger(ActivityServiceImpl.class);
    //活动缓存前缀
    private final String ACTIVITY_PREFIX = "ACTIVITY_";
    //活动缓存
    private final Long ACTIVITY_TIMEOUT = 60*60*24*3L;

    @Autowired
    private UserMapper userMapper;
    @Autowired
    private PrizeMapper prizeMapper;
    @Autowired
    private ActivityMapper activityMapper;
    @Autowired
    private ActivityPrizeMapper activityPrizeMapper;
    @Autowired
    private ActivityUserMapper activityUserMapper;
    @Autowired
    private RedisUtil redisUtil;

    @Override
    @Transactional(rollbackFor = Exception.class) //涉及多表
    public CreateActivityDTO createActivity(CreateActivityParam param) {
        //校验活动信息是否正确
        checkActivityInfo(param);
        //保存活动信息
        ActivityDO activityDO = new ActivityDO();
        activityDO.setActivityName(param.getActivityName());
        activityDO.setDescription(param.getDescription());
        activityDO.setStatus(ActivityStatusEnum.RUNNING.name());
        activityMapper.insert(activityDO);

        //保存活动关联的奖品信息
        List<CreatePrizeByActivityParam> prizeParams = param.getActivityPrizeList();
        List<ActivityPrizeDO> activityPrizeDOList = prizeParams.stream()
                .map(prizeParam->{
                    ActivityPrizeDO activityPrizeDO = new ActivityPrizeDO();
                    activityPrizeDO.setActivityId(activityDO.getId());
                    activityPrizeDO.setPrizeId(prizeParam.getPrizeId());
                    activityPrizeDO.setPrizeAmount(prizeParam.getPrizeAmount());
                    activityPrizeDO.setPrizeTiers(prizeParam.getPrizeTiers());
                    activityPrizeDO.setStatus(ActivityPrizeStatusEnum.INIT.name());
                    return activityPrizeDO;
                }).collect(Collectors.toList());
        activityPrizeMapper.batchInsert(activityPrizeDOList);
        //保存活动关联的人员
        List<CreateUserByActivityParam> userParams = param.getActivityUserList();
        List<ActivityUserDO> activityUserDOList = userParams.stream()
                .map(userParam->{
                    ActivityUserDO activityUserDO = new ActivityUserDO();
                    activityUserDO.setActivityId(activityDO.getId());
                    activityUserDO.setUserId(userParam.getUserId());
                    activityUserDO.setUserName(userParam.getUserName());
                    activityUserDO.setStatus(ActivityUserStatusEnum.INIT.name());
                    return activityUserDO;
                }).collect(Collectors.toList());
        activityUserMapper.batchInsert(activityUserDOList);
        //整合完整的活动信息,存放redis
        //先获取奖品基本属性列表
        //获取需要查询的奖品id
        List<Long> prizeIds = param.getActivityPrizeList().stream().map
                (CreatePrizeByActivityParam::getPrizeId)
                .distinct()
                .collect(Collectors.toList());
        List<PrizeDO> prizeDOList= prizeMapper.batchSelectByIds(prizeIds);
        ActivityDetailDTO detailDTO = convertToActivityDetailDTO(activityDO, activityUserDOList, prizeDOList, activityPrizeDOList);
        cacheActivity(detailDTO);
        //构造返回
        CreateActivityDTO createActivityDTO = new CreateActivityDTO();
        createActivityDTO.setActivityId(activityDO.getId());
        return createActivityDTO;
    }

    @Override
    public PageListDTO<ActivityDTO> findActivityList(PageParam param) {
        //获取总量
        int total = activityMapper.count();
        //获取当前页列表
        List<ActivityDO> activityDOList = activityMapper.selectActivityList(param.offset(),param.getPageSize());
        List<ActivityDTO> activityDTOList = activityDOList.stream()
                .map(activityDO -> {
                    ActivityDTO activityDTO = new ActivityDTO();
                    activityDTO.setActivityId(activityDO.getId());
                    activityDTO.setActivityName(activityDO.getActivityName());
                    activityDTO.setDescription(activityDO.getDescription());
                    activityDTO.setStatus(ActivityStatusEnum.forName(activityDO.getStatus()));
                    return activityDTO;
                }).collect(Collectors.toList());
        return new PageListDTO<>(total,activityDTOList);
    }

    @Override
    public ActivityDetailDTO getActivityDetail(Long activityId) {
        if (null == activityId) {
            log.warn("查询活动详细信息失败,activityId为空");
            return null;
        }
        //查询 redis
        ActivityDetailDTO detailDTO = getAcitivityFromCache(activityId);
        if(null != detailDTO) {
            log.info("查询活动详细信息成功!detailDTO:{}",JacksonUtil.writeValueAsString(detailDTO));
            return detailDTO;
        }
        //如果redis不存在对应的数据,查表
        //活动表
        ActivityDO activityDO = activityMapper.selectById(activityId);
        //活动奖品表
        List<ActivityPrizeDO> activityPrizeDOList = activityPrizeMapper.selectByActivityId(activityId);
        //活动人员表
        List<ActivityUserDO> activityUserDOList = activityUserMapper.selectByActivityId(activityId);
        //奖品表:先获取要查询的奖品id
        List<Long> prizeIds = activityPrizeDOList.stream()
                .map(ActivityPrizeDO::getPrizeId)
                .collect(Collectors.toList());
        List<PrizeDO> prizeDOList = prizeMapper.batchSelectByIds(prizeIds);
        //整合活动详细信息存放redis
        detailDTO = convertToActivityDetailDTO(activityDO, activityUserDOList, prizeDOList, activityPrizeDOList);
        cacheActivity(detailDTO);
        //返回
        return detailDTO;
    }

    @Override
    public void cacheActivity(Long activityId) {
        if(null == activityId) {
            log.warn("要缓存的活动id为空");
            throw new ServiceException(ServiceErrorCode.CACHE_ACTIVITY_ID_IS_EMPTY);
        }
        //查询表数据:活动表,关联奖品,关联人员,奖品信息表
        ActivityDO activityDO = activityMapper.selectById(activityId);
        if(null == activityDO) {
            log.error("要缓存的活动id有误");
            throw new ServiceException(ServiceErrorCode.CACHE_ACTIVITY_ID_ERROR);
        }
        List<ActivityPrizeDO> activityPrizeDOList = activityPrizeMapper.selectByActivityId(activityId);
        List<ActivityUserDO> activityUserDOList = activityUserMapper.selectByActivityId(activityId);
        //奖品表:先获取要查询的奖品id
        List<Long> prizeIds = activityPrizeDOList.stream()
                .map(ActivityPrizeDO::getPrizeId)
                .collect(Collectors.toList());
        List<PrizeDO> prizeDOList = prizeMapper.batchSelectByIds(prizeIds);
        //整合活动详细信息存放redis
        cacheActivity(convertToActivityDetailDTO(activityDO, activityUserDOList, prizeDOList, activityPrizeDOList));

    }

    //缓存完整的活动信息
    private void cacheActivity(ActivityDetailDTO detailDTO) {
        //key:ACTIVITY_activityId
        //value:ActivityDetailDTO(json)
        if(null == detailDTO || null == detailDTO.getActivityId()){
            log.warn("要缓存的活动信息不存在");
            return;
        }
        try {
            redisUtil.set(ACTIVITY_PREFIX+detailDTO.getActivityId(),
                    JacksonUtil.writeValueAsString(detailDTO),
                    ACTIVITY_TIMEOUT);
        } catch (Exception e) {
            log.error("缓存活动异常, ActivityDetailDTO={}", detailDTO, e);
        }
    }

    //根据活动id从缓存中获得活动详细信息
    private ActivityDetailDTO getAcitivityFromCache(Long activityId) {
        if(null == activityId){
            log.warn("获取缓存活动数据的activityId为空");
            return null;
        }
        try {
            String str = redisUtil.get(ACTIVITY_PREFIX+activityId);
            if(!StringUtils.hasText(str)){
                log.warn("获取的缓存活动数据为空,key={}", ACTIVITY_PREFIX+activityId);
                return null;
            }
            return JacksonUtil.readValue(str, ActivityDetailDTO.class);
        }catch (Exception e) {
            log.error("从缓存中获取活动信息异常, key={}", ACTIVITY_PREFIX+activityId, e);
            return null;
        }
    }

    //根据基本DO整合完整的活动信息ActivityDetailDTO
    private ActivityDetailDTO convertToActivityDetailDTO(ActivityDO activityDO, List<ActivityUserDO> activityUserDOList, List<PrizeDO> prizeDOList, List<ActivityPrizeDO> activityPrizeDOList) {
        ActivityDetailDTO activityDetailDTO = new ActivityDetailDTO();
        activityDetailDTO.setActivityId(activityDO.getId());
        activityDetailDTO.setActivityName(activityDO.getActivityName());
        activityDetailDTO.setDesc(activityDO.getDescription());
        activityDetailDTO.setStatus(ActivityStatusEnum.forName(activityDO.getStatus()));

        List<ActivityDetailDTO.PrizeDTO> prizeDTOList = activityPrizeDOList.stream()
                .map(activityPrizeDO -> {
                    ActivityDetailDTO.PrizeDTO prizeDTO = new ActivityDetailDTO.PrizeDTO();
                    prizeDTO.setPrizeId(activityPrizeDO.getPrizeId());
                    Optional<PrizeDO> optionalPrizeDO = prizeDOList.stream().filter(prizeDO ->
                            prizeDO.getId().equals(activityPrizeDO.getPrizeId())
                    ).findFirst();
                    //如果PrizeDO为空,不执行当前方法,不为空才执行
                    optionalPrizeDO.ifPresent(prizeDO -> {
                        prizeDTO.setName(prizeDO.getName());
                        prizeDTO.setImageUrl(prizeDO.getImageUrl());
                        prizeDTO.setPrice(prizeDO.getPrice());
                        prizeDTO.setDescription(prizeDO.getDescription());
                    });

                    prizeDTO.setTiers(ActivityPrizeTiersEnum.forName(activityPrizeDO.getPrizeTiers()));
                    prizeDTO.setPrizeAmount(activityPrizeDO.getPrizeAmount());
                    prizeDTO.setStatus(ActivityPrizeStatusEnum.forName(activityPrizeDO.getStatus()));
                    return prizeDTO;
                }).collect(Collectors.toList());

        activityDetailDTO.setPrizeDTOList(prizeDTOList);
        List<ActivityDetailDTO.UserDTO> userDTOList = activityUserDOList.stream()
                .map(activityUserDO -> {
                    ActivityDetailDTO.UserDTO userDTO = new ActivityDetailDTO.UserDTO();
                    userDTO.setUserId(activityUserDO.getUserId());
                    userDTO.setUserName(activityUserDO.getUserName());
                    userDTO.setStatus(ActivityUserStatusEnum.forName(activityUserDO.getStatus()));
                    return userDTO;
                }).collect(Collectors.toList());
        activityDetailDTO.setUserDTOList(userDTOList);
        return activityDetailDTO;
    }

    //校验活动信息是否正确
    private void checkActivityInfo(CreateActivityParam param) {
        if(null == param) {
            throw new ServiceException(ServiceErrorCode.CEEATE_ACTIVITY_INFO_IS_EMPTY);
        }
        //人员id在人员表中是否存在
        List<Long> userIds = param.getActivityUserList().stream()
                .map(CreateUserByActivityParam::getUserId)
                .distinct() //去重
                .collect(Collectors.toList());
        List<Long> existUserIds = userMapper.selectExistByIds(userIds);
        if(CollectionUtils.isEmpty(existUserIds)) {
            throw new ServiceException(ServiceErrorCode.ACTIVITY_USER_ERROR);
        }
        userIds.forEach(id-> {
            if(!existUserIds.contains(id)) {
                throw new ServiceException(ServiceErrorCode.ACTIVITY_USER_ERROR);
            }
        });
        //奖品id在奖品表中是否存在
        List<Long> prizeIds = param.getActivityPrizeList().stream()
                .map(CreatePrizeByActivityParam::getPrizeId)
                .distinct() //去重
                .collect(Collectors.toList());
        List<Long> existPrizeIds = prizeMapper.selectExistByIds(prizeIds);
        if(CollectionUtils.isEmpty(existPrizeIds)) {
            throw new ServiceException(ServiceErrorCode.ACTIVITY_PRIZE_ERROR);
        }
        prizeIds.forEach(id-> {
            if(!existPrizeIds.contains(id)) {
                throw new ServiceException(ServiceErrorCode.ACTIVITY_PRIZE_ERROR);
            }
        });

        //人员数量是否大于等于奖品数量
        int userAmount = param.getActivityUserList().size();
        long prizeAmount = param.getActivityPrizeList().stream()
                .mapToLong(CreatePrizeByActivityParam::getPrizeAmount)
                .sum();
        if(userAmount < prizeAmount) {
            throw new ServiceException(ServiceErrorCode.USER_PRIZE_AMOUNT_ERROR);
        }

        //校验活动奖品等级有效性
        param.getActivityPrizeList().forEach(prize->{
            if(null== ActivityPrizeTiersEnum.forName(prize.getPrizeTiers())) {
                throw new ServiceException(ServiceErrorCode.ACTIVITY_PRIZE_TIERS_ERROR);
            }
        });
    }
}
